﻿Non-porous surfaces. Front side is lined and the back is a blank white dry erase surface. This dry erase board features our "goof-proof" dry erase surface with handwriting guidelines 1" apart etched and locked onto the surface. Turn sideways and you have columns for math work. The board itself is a solid, wood board 1/8" thick. All edges and corners are rounded for safety and durability. Unbeatable Markerboard People quality. - item # RC0912-2x